Results 61 to 70 of about 7,025,957 (218)

Seeking for the progenitors of Type Ia Supernovae [PDF]

AIP Conference Proceedings, 2009
The nature of the progenitor system[s] of Type Ia Supernovae is still unclear. In this contribution I review the projects that have been undertaken to answer this question and the results they have led to. The conclusion is that, as of today, we have reasonable guesses but none of them has yet been proven by direct observations.
F. Patat, Giuliana Giobbi, Amedeo Tornambe, Gabriella Raimondo, Marco Limongi, L. A. Antonelli, Nicola Menci, Enzo Brocato   +7 more
openaire   +2 more sources

Early Lightcurves of Type Ia Supernovae Are Consistent with Nondegenerate Progenitor Companions

The Astrophysical Journal
If Type Ia supernovae (SNe Ia) result from a white dwarf being ignited by Roche-lobe overflow from a nondegenerate companion, then as the SN explosion runs into the companion star its ejecta will be shocked, causing an early blue excess in the lightcurve.
J. Burke, M. Andrews, D. A. Howell, D. J. Sand, R. C. Amaro, P. J. Brown, J. E. Andrews, K. A. Bostroem, Y. Dong, J. Haislip, D. Hiramatsu, G. Hosseinzadeh, V. Kouprianov, M. J. Lundquist, C. McCully, C. Pellegrino, D. Reichart, L. Tartaglia, S. Valenti, S. Wyatt, S. Yang   +20 more
doaj   +1 more source

Bump Morphology of the CMAGIC Diagram

The Astrophysical Journal, 2023
We apply the color–magnitude intercept calibration method (CMAGIC) to the Nearby Supernova Factory SNe Ia spectrophotometric data set. The currently existing CMAGIC parameters are the slope and intercept of a straight line fit to the linear region in the
L. Aldoroty, L. Wang, P. Hoeflich, J. Yang, N. Suntzeff, G. Aldering, P. Antilogus, C. Aragon, S. Bailey, C. Baltay, S. Bongard, K. Boone, C. Buton, Y. Copin, S. Dixon, D. Fouchez, E. Gangler, R. Gupta, B. Hayden, Mitchell Karmen, A. G. Kim, M. Kowalski, D. Küsters, P.-F. Léget, F. Mondon, J. Nordin, R. Pain, E. Pecontal, R. Pereira, S. Perlmutter, K. A. Ponder, D. Rabinowitz, M. Rigault, D. Rubin, K. Runge, C. Saunders, G. Smadja, N. Suzuki, C. Tao, R. C. Thomas, M. Vincenzi   +40 more
doaj   +1 more source

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

Nachtsicht ins All mit dem bloßen Auge: Sag mir, wie weit die Sterne steh'n

Physik in unserer Zeit, Volume 57, Issue 1, Page 32-40, January 2026.
Beim Blick in den Nachthimmel sehen wir ohne optische Hilfsmittel und abhängig von der lokalen Lichtverschmutzung viele Hundert bis maximal einige Tausend Sterne und auch einige Galaxien. Aber wie weit sind diese von uns entfernt? Und bis zu welchen maximalen Entfernungen können wir Objekte im Weltall mit dem bloßen Auge wahrnehmen?
Michael Vollmer
wiley   +1 more source

Cosmic expansion in homogeneous and inhomogeneous universes : supernovae type Ia as cosmic probes [PDF]

, 2010
Seikel M. Cosmic expansion in homogeneous and inhomogeneous universes : supernovae type Ia as cosmic probes. Bielefeld (Germany): Bielefeld University; 2010.Since it has been discovered in the late 1990s that the universe is likely to be expanding ...
Seikel, Marina
core  

SN 2022joj: A Potential Double Detonation with a Thin Helium Shell

The Astrophysical Journal
We present photometric and spectroscopic data for SN 2022joj, a nearby peculiar Type Ia supernova (SN Ia) with a fast decline rate (Δ m _15,B = 1.4 mag).
E. Padilla Gonzalez, D. A. Howell, G. Terreran, C. McCully, M. Newsome, J. Burke, J. Farah, C. Pellegrino, K. A. Bostroem, G. Hosseinzadeh, J. Pearson, D. J. Sand, M. Shrestha, N. Smith, Y. Dong, N. Meza Retamal, S. Valenti, S. Boos, K. J. Shen, D. Townsley, L. Galbany, L. Piscarreta, R. J. Foley, M. J. Bustamante-Rosell, D. A. Coulter, R. Chornock, K. W. Davis, C. B. Dickinson, D. O. Jones, J. Kutcka, X. K. Le Saux, C. R. Rojas-Bravo, K. Taggart, S. Tinyanont, G. Yang, S. W. Jha, R. Margutti   +36 more
doaj   +1 more source

Propagating Uncertainties in the SALT3 Model-training Process to Cosmological Constraints

The Astrophysical Journal Supplement Series, 2023
Type Ia supernovae (SNe Ia) are standardizable candles that must be modeled empirically to yield cosmological constraints. To understand the robustness of this modeling to variations in the model-training procedure, we build an end-to-end pipeline to ...
M. Dai, D. O. Jones, W. D. Kenworthy, R. Kessler, J. D. R. Pierel, R. J. Foley, S. W. Jha, D. M. Scolnic   +7 more
doaj   +1 more source

Testing the Weak Cosmic Censorship Conjecture via Test Particle–Induced Overcharging/Overspinning of Kerr–Newman–Modified Gravity Black Hole

Advances in Astronomy, Volume 2026, Issue 1, 2026.
We examine the weak cosmic censorship conjecture (WCCC) violation by throwing a charged and rotating test particle into a Kerr–Newman–modified gravity black hole (KN–MOG BH). The result depends on several factors, such as the relative sign of the particle’s charge and its direction of rotation with respect to black hole (BH).
Waqar Ahmad, Abdul Rehman Kashif, Jose Gaite   +2 more
wiley   +1 more source

Spectropolarimetry of the Type Ia supernova 2012fr [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2013
AbstractSpectropolarimetry provides the means to probe the 3D geometries of supernovae (SNe) at early times. We report spectropolarimetric observations of the Type Ia SN 2012fr at four epochs: −11, −5, +2 and +24 d, with respect to B-light-curve maximum.
Maund, Justyn Robert, Spyromilio, J., Hoeflich, P.A., Wheeler, J.C., Baade, D., Clocchiatti, A., Patat, F., Reilly, E., Wang, L., Zelaya, P.   +9 more
openaire   +3 more sources